Device for swaging gold-plate for crown or bridge work



(No Model.)

W. H. BAIRD,

DEVICE FOR SWAGING GOLD PLATE FOR CROWN 0R BRIDGE WORK. No. 600,604.Patented Mar. 15, 1898.

lel movement relative to each other.

'Nrrn STATES PATENT OFFICE.

\VILLIAMHARAH BAIRD, OF BURLINGTON, IOWVA.

DEVICE FOR SWAGlNG GOLD-PLATE FOR CROWN 0R BRIDGE WORK.

SPECIFICATION forming part of Letters Patent No. 600,604, dated March15, 1898.

Application filed June 15 1897. Serial N0- 640,894. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM HARAI-I BAIRD, a citizen of the UnitedStates, residing at Burlington, in the county of Des Moines and State ofIowa, have invented certain new and useful Improvements in Devices forSwaging Gold-Plate for Crown or BridgeWork; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to an improvement in apparatus for swaginggold-plate for making crown and bridge work for dental purposes; and itis embodied in the construction and arrangement of parts hereinafterstated, described, and definitely pointed out in the claims.

The apparatus employed in carrying out the invention is by preferencecomposed of two members, one or both of which are movable toward andaway from the other, preferably in a parallel plane, and between the twomembers is interposed a male die, the metal to be worked, and therelatively soft material into which the die and metal are forced.

In the drawings I have illustrated a preferred form of apparatus ordevice; but I desire it understood that the invention is not limited tothe particular device shown, as changes in the construction andarrangement of parts can be made without departing from the nature andspirit of the invention.

In the said drawings, Figure 1 is a side elevation of the completeapparatus or device. Fig. 2 is a section on line 00 as, Fig. 1; and Fig.3 is a plan view of a die-holder, showing a die removed and located atone side.

In the drawings I have shown what may be conveniently termed parallelpliers that is, pliers wherein the two jaws have a paral- The lower j awA of the pliers is constructed in the form of an anvil having anextendedseat portion or base a and a dovetailed recess or groove (1., formed inits upper face. The upper member B has a fiat under face and anupwardly-extended elongated striking-section I). These two members A andB are preferably formed of hard metal and have on their rear adjacentfaces or sides the rear- ;wardly-extending arms 0 D, having bifurcatedends 0 d.

E E designate the handles, which are crossed in the usual manner andpivotally connected by a central bolt (2 at the point of crossing. Theshort projecting ends of the handles are pivotally connected by pins 6to slide F, fashioned to fit within the dovetailed groove a, whichlatter has an open front end, so that the slide may be easily slippedinto the groove and removed therefrom when desired.

The slide F carries a male die, which may be either integral therewithor, as shown in Figs. 2 and 3, detachably placed therein by having thesame fitted into a suitable socket or seat f, formed in the slide. Thedie, which is designated by the letter H, is designed as an exactduplicate of the desired surface to be crowned, built up, or bridged,and is formed of hard steel. It is intended that in connection with theapparatus a series of dies shall be used, each fashioned to be receivedand held by the lower jaw, the series representing, respectively, exactduplicates of the respective natural teeth or parts-such as, forinstance, the front and back of the incisor and cuspid teeth, the faceor cutting-surface of the molar and bicuspid teeth, both upper andlower, there being by preference but one of the latter upon therespective die; but of the former both front and back may beconveniently placed upon a single die.

In using the apparatus the die is inserted in the lower jaw of theapparatus. The goldplate is placed upon the die. A bar of soft lead K(shown in dotted lines, Fig. 1) is then placed over the gold-plate andagainst the under face of the upper jaw. When in this position, the jawsare closed to prevent the slip ping or moving of the two plates. Theanvil or lower member of the pliers is then placed upon a solid base,and the upper jaw is struck with a hammer or other suitable implementuntil the gold-plate is swaged to conform to the contour of thedie, thesoft metal or lead being also indented and yielding to the pressure. Bythis means the gold is swaged in the plate, leaving the clear imprint ofthe die on both its outer and inner face. The plate is then taken outand worked into a crown, bridge, or abutment for a bridge.

It is obvious that the die can be mounted in the slide in a manner otherthan that shown, and it is to be understood that in that respect theinvention is not limited to the form shown and described.

As stated above, while I have shown a special form of pliers, yet Idesire it understood that any desired form may be employed, whether ofthe pliers type or press type, so long as the two jaws are arranged tohave a parallel movement and fit perfectly upon one another.

Having thus described the invention, what is claimed as new, and desiredto be secured by Letters Patent, is-

1. The combination with a jaw A having the extension Ct and aretaining-groove in its upper face, of a slide carrying a male dieremovably held in the recess, an upper jaw B having a hammer extension5, handles pivotally connected with the jaws, a fiat-faced softmetalblock between the jaws and means whereby the jaws are moved parallel,substantially as described.

2. The combination with two parallel jaws and means for moving themtoward each other the upper jaw having a striking extension thereon andthe lower jaw having a flat resting extension, a slide carried by thelower jaw, and a die removably carried by the slide, substantially asdescribed.

3. The combination with two parallel jaws and means for moving themtoward each other the upper jaw having a striking extension thereon andthe lower jaw having a fiat resting extension, a slide carried by one ofthe jaws, and a die removably carried by the slide, substantially asdescribed.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM HARAII BAIRD.

WVitnesses:

AMELIA PETERSON, THEO. W. NIEMANN.

